Apparatus for making compound twisted bolts.



J. A. FRAUENHEIM. APPARATUS FOR MAKING COMPOUND TWISTED BOLTS.APPLICATION FILED 050.29, 19:4.

- 1,226,497 Patented May 15, 1917.

INVENTOR MTED STATEd AEN FllQE.

JOSEPH A. FBAUENHEIM, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO KERNERMANUFACTURING COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

APPARATUS FOR MAKING COMPOUND TWISTED BOLTS.

Specification of Letters Patent.

Patented llli'ay 15, 19.17.

Application filed December 29, 1914. Serial No. 879,456.

To all "whom it may concern Be it known that I, Josnrrr A. FRAUEN- 1mm,a citizen of the United States, residing at Pittsburgh, in the countyof: Allegheny and State of Pennsylvania, have invented a new and usefulImprovement in Apparatus for Making Compound Twisted Bolts, of which thefollowing is a full, clear, and exact description, reference being hadto the accompanying drawings, forming part of this specification, inwhich Figure 1 is a side elevation partly in section of the dies forforming the complementary members from which the bolts are built up;

Fig. 2 is a plan view of one of the die members;

Fig. 3 is an inverted plan view of another of said die members;

Fig. t is an end View of the die members shown in F 1 and 2.

Figs. 5, 6, and 7 are sectional views on the lines V-V, VT-VI andVIIVII, respectively, of Fig. 1;

Fig. 8 is a side elevation of two of the complementary members whichhave been separated Fig. 9 is a similar view showing the members inproper relation to each other;

Fig. 10 is one form of a finished bolt; and Fig. 11 is another form of afinished bolt. This invention relates to improvements in 'an apparatusfor the manufacture of compound twisted bolts formed of a plurality ofcomplementary members; and is designed to provide an apparatus by whichbolts of this character can be accurately and rapidly made.

The precise nature of my invention will 40 be best understood byreference to the acrompanying drawings, which will now be described, itbeing premised, however, that various changes may be made in the detailsof construction of the forming members,

without departing from the spirit and scope of my invention as definedby the appended claims.

In the drawings, the numeral 2 designates one of the die members, and 3the other member. 4: designates a heading tool, and 5 a stop for theblank, which is adapted to be moved into proper position with relationto the die members 2 and 3, to stop the forward movement of a blank,such as indicated at 6.

7 designates a shear member, which I have shown as being carried by thedie member 3, although this shear member might be connected in any otherway and operated independently of the die member The die member 2 has asemicylindrical blank-receiving cavity 2, while the member 3 has ahelical die surface 3, which corresponds in form to the form of theinner face of the finished bolt blank or section. As will be seen byreference to Figs. 5, 6 and 7, this helical face is twisted through anangle of approximately ninety degrees. lVhen the two die members arebrought together upon a headed blank, the latter is not only shaped downinto the desired form, but it is also given a helical twist by reason ofthe action of the die surface 3. The precise form of this die surfacewill, of course, depend upon the amount of twist which it is desired togive the bolt section, as well as upon the 1pumber'of sections to housedin forming a olt.

The die member 3 also has at one end a projection 3 which corresponds inform to one-half of a bolt head, and which is adapted to enter theheading recess 4 of the heading tool 4.

The blank 6 is moved into the die member in the direction indicated bythe arrow, until it engages the stop 5, which has been advanced to aposition between the heading tool 4 and the die members 2 and 3, asindicated in dotted lines in Fig. 1. The die memher 3 is then moveddownwardly to shear off a section, such as indicated at 8, between thedies in Fig. 1, and at the same time, to twist the 1 blank about theaxis of the curved portion of the die members. After the blank has beentwisted, the heading tool 4: is moved toward the die members to upsetthe head on the end thereof, the half-head portion 3 on the member 3cooperating with the recess 4 to center the heading tool 4:.

After the blanks have been formed in the manner described, two of theblanks are placed together and held in any manner at the headed end, andare then threaded at the other end. If it is desired to form bolts suchas shown in Fig. 11, the heading tool will not be used.

In the drawings, I have shown dies for forming semicylindrical boltmembers, so that the finished bolt will be built up of two similarlyshaped members, but it will be readily understood by those familiar withthe art that bolts having any number of complementary members can bemade by my method and apparatus.

The advantages of my invention result from the provision of means fordie-forming twisted complementary members for compound bolts, wherebythe blanks or members are twisted about the center of the arc of acurved portion of the blanks. Also, from the provision of means forupsetting the headed portions on the ends of said members, together withmeans on one of the die members for centering the heading tool.

By the use of an arrangement of this character, the heading tools usedtoday can readily be used in connection with dies, such as shown in thedrawings, as it will only be necessary to form a portion of the head onone of the die members. Inasmuch as all the sections may be made in thesame dies, they can be assembled indiscriminately and will accuratelyfit each other to form the finished bolts, which will be withoutsubstantial variation. By simply changing the die member 3 to one havinga different form of projection 3 together with the heading tool, thestyle of head can be varied without changing the die members 2 and 8.

I claim:

1. Apparatus for forming semi-blanks for twisted compound bolts,comprising die members movable relatively to each other and in atransverse direction relative to the blank, one of the members having anareshaped recess extending across the entire face thereof and the othermember having a helically curved face arranged to engage a flat face ofthe blank and rotate portions of the blank over the arc-shaped face ofthe other member to twist the blank, substantially as described.

2. Apparatus for forming semiblanks for twisted compound bolts,comprising die members movable relative to each other and in atransverse direction relative to the blank, one of the members having anareshaped recess extending across the entire face thereof and the othermember having a Copies of this patent may be obtained for five centseach, by addressing the Commissioner of Patents,

helically curved face arranged to engage a flat face of the blank androtate portions of the blank over the arc-shaped face of the othermember to twist the blank, and a heading tool adapted to form one-halfof a head on one end of the blanks, substantially as described.

3. A die for shaping semi-cylindrical twisted members for compoundbolts, comprising a plurality of members movable relatively to eachother, one of said members having an arc-shaped recess and the othermember having a helically curved shaping face, said face beingapproximately flat transversely at all points. throughout its length,substantially as described.

A die for shaping members for twisted compound bolts, comprising aplurality of members movable relatively to each other, one of saidmembers having an arc-shaped recess extending across the entire facethereof, and the other member having a helically curved shaping face,said face being approximately flat transversely at all points throughoutits length, and a third die member having a head-forming recess arrangedto be moved toward the other member to upset a head on the end of theblank, substantially as described.

5. A die for shaping members for twisted compound bolts, comprising aplurality of members movable relatively to each other, one of saidmembers having an arc-shaped recess, and the other member having ahelical shaping face curved about the center of the arc-shaped recess,and a third die member having a head-forming recess arranged to be movedtoward the other member to upset a head on the end of the blank, and oneof the first named members having a projection which cooperates with thehead-forming recess to center the heading tool and to shape the head ofthe blank, substantially as described.

In testimony whereof, I have hereunto set my hand.

JOSEPH A. FRAUENHEIM. WVitnesses:

Gno. B. BLEMING, H. M. OoRwIN.

Washington, D. G."

